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1. Doppler flowmeter
2. How to solve the problem of high gas phase diversion flow rate
High gas phase diversion flow rate will directly affect the accuracy and repeatability of analysis results, and must be promptly investigated and adjusted. 1. Adjusting the diversion valve. The diversion valve is a key component for controlling the diversion ratio. When the flow rate is too high, you can try slowly rotating the diversion valve adjustment knob counterclockwise to reduce its opening. When adjusting, it is necessary to closely observe the real-time numerical changes of the flow meter to avoid excessive fluctuations in flow caused by excessive movement. 2. Checking the carrier gas pressure is a common cause, and the initial pressure of the carrier gas is too high. The output pressure of the secondary gauge of the gas cylinder pressure reducing valve should be checked, and according to the analysis method requirements, the pressure should be adjusted to the recommended range of the chromatographic column through the electronic gas path control module or manual pressure reducing valve on the instrument panel. 3. Maintenance and replacement of components. If the trap or filter in the diversion flow path is blocked, it will cause changes in flow path resistance and abnormal increase in flow rate. Replacement can be carried out according to the operating time or injection frequency of the instrument, following the instructions in the manual. At the same time, check whether the graphite pads and nuts at both ends of the chromatographic column are tightened to ensure that there are no air leakage points. Optimization method parameters sometimes have unreasonable split ratio settings. You can enter the instrumen
3. What is the measurement principle of multiphase flowmeter? Multiphase flowmeter (MPFM) is a core equipment used to simultaneously measure the flow rates of each phase in multiphase mixed fluids such as oil, gas, and water. It is widely used in fields such as petroleum extraction and chemical engineering. The core logic of its measurement is to first obtain the total flow rate/velocity of the mixed fluid and the volume fraction (phase fraction) of each phase, and then calculate the phase flow rate of each phase by combining it with the phase slip velocity model. Multiphase flow is much more difficult to measure than single-phase flow due to its complex flow pattern, uneven phase state, and slip velocity (different gas-liquid flow velocities). The mainstream technical routes are divided into three categories: separation type, premixed type, and online type without pretreatment. The following provides a detailed explanation of the principles, technical implementation, and core measurement methods.
1. Core Measurement Logic of Multiphase Flow Meter The essence of multiphase flow measurement is to solve the volume flow rate of each phase. The core formula is: single phase volume flow rate=total flow rate of mixed fluid x volume fraction of the phas
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